[英]How can I retrieve all nodes data from Firebase to listview in Android?
我已經按照下面的教程進行了工作,但是它只能檢索一個空間節點數據,如何檢索所有節點數據? 下面的照片是我的數據庫。
DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReferenceFromUrl("my url");
final FirebaseListAdapter<String> firebaseListAdapter = new FirebaseListAdapter<String>(this, String.class, android.R.layout.simple_list_item_1, databaseReference) {
@Override
protected void populateView(View v, String model, int position) {
TextView textView= (TextView) v.findViewById(android.R.id.text1);
textView.setText(model);
}
};
listView.setAdapter(firebaseListAdapter);
FirebaseListAdapter
可以顯示項目列表 。 您的數據模型不是列表,而是樹。 因此,無法使用單個FirebaseListAdapter
進行顯示。
我創建了用於綁定ListView
Adapter
類和用於在ListView
顯示項目列表的row_item.xml 。
FireListAdapter.java
public class FireListAdapter extends BaseAdapter {
private List<User> modelList = new ArrayList<User>();
private Context context;
LayoutInflater inflater;
public FireListAdapter(Context context, List<User> modelList) {
this.context = context;
this.modelList = modelList;
inflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return modelList.size();
}
@Override
public Object getItem(int position) {
return modelList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View view, ViewGroup parent) {
view = inflater.inflate(R.layout.row_item, null);
TextView textName = (TextView) view.findViewById(R.id.textName);
TextView textEmail = (TextView) view.findViewById(R.id.textEmail);
textName.setText(modelList.get(position).getName());
textEmail.setText(modelList.get(position).getEmail());
return view;
}
}
並創建Welcome.java來顯示ListView
FirebaseDatabase
中的數據。
public class Welcome extends AppCompatActivity implements View.OnClickListener {
private ListView listView;
private List<User> myModelList = new ArrayList<User>();
private DatabaseReference mFirebaseDatabase;
private FirebaseDatabase mFirebaseInstance;
private String TAG = Welcome.class.getSimpleName();
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.welcome);
setUI();
mFirebaseInstance = FirebaseDatabase.getInstance();
// get reference to 'signUp' node Here signUp is table in FirebaseDatabase
mFirebaseDatabase = mFirebaseInstance.getReference("signUp");
getData();
}
public void setUI() {
textProfile = (TextView) findViewById(R.id.textWelcome);
listView = (ListView) findViewById(R.id.listItem);
}
//This method is getting data from FirebaseDatabase
public void getData() {
mFirebaseDatabase.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
Iterable<DataSnapshot> snapshotIterable = dataSnapshot.getChildren();
Iterator<DataSnapshot> iterator = snapshotIterable.iterator();
while (iterator.hasNext()) {
DataSnapshot dataSnapshot1 = iterator.next();
User user = dataSnapshot1.getValue(User.class);
user.setName(user.getName());
user.setEmail(user.getEmail());
myModelList.add(user);
FireListAdapter fireListAdapter = new FireListAdapter(Welcome.this, myModelList);
fireListAdapter.notifyDataSetChanged();
listView.setAdapter(fireListAdapter);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
}
希望這個能對您有所幫助 :)
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